“Having owned the HD 800 for more than three and a half years now I've spent untold hours looking into ways of bringing the best possible sound out of them. When Sennheiser announced the HDVD 800 it made my future upgrade decisions easy. I took the chance of being an early adopter, getting it before any reviews were out and hardly anyone had even posted impressions. Now several months later I...” --TheManko

“I think this is one time I was thankful another headphone amp failed and I was forced to seek out a replacement. I stumbled on the Sennheiser HDVA 600 with it's balanced inputs, balanced pass through outputs, enough headphone outputs for (2) sets of balanced headphones and (2) sets of 1/4" headphone plugs. This headphone amplifier is beautiful, modern, elegant, what you would expect...” --LiteJazz